Flex coat hot melt tip top glue stick is the best one I have found so far. Avoid the Fuji brand. It's the absolute worst I have found so far. I got a stick, two actually, of Fuji once. I ended up redoing every last tip I used it on. Some of them right away. They even come loose on a hot sunny day just setting there. Worst stuff ever.

This is a few years ago now so hopefully they have changed the formula, but I will never touch the stuff again to find out.